Fused polycyclic compound, and preparation method and use thereof

ABSTRACT

The present invention relates to the field of display technologies, and particularly to a fused polycyclic compound, and a preparation method and use thereof. The fused polycyclic compound provided in the present invention has a structure of General Formula IV. The structure of the compound has ambipolarity, and the HOMO level and the LUMO level of the host material are respectively located on different electron donating group and electron withdrawing group, such that the transport of charges and holes in the host material becomes more balanced, thereby expanding the area where holes and electrons are recombined in the light emitting layer, reducing the exciton concentration, preventing the triplet-triplet annihilation of the device, and improving the efficiency of the device.

RELATED APPLICATION

This application claims priority under 35 U.S.C. § 119(b) to Chinese Application No. 201910353474.7 filed on Apr. 29, 2019. The entire teachings of the above application are incorporated herein by reference.

BACKGROUND Technical Field

The present invention relates to the field of display technologies, and particularly to a fused polycyclic compound, and a preparation method and use thereof.

Related Art

Organic light-emitting diodes (OLEDs) are a new display technology that has more promising application prospects than liquid crystal display technology, due to their fast response time, low energy consumption, self-lighting, wide color gamut, ultra-thin thickness, foldability and flexibility, thus receiving more and more attention.

In 1987, the first organic light-emitting diode (OLED) device was initially fabricated by Deng Qingyun et al. from the Eastman Kodak Laboratory by means of vacuum deposition, which comprises transparent and conductive indium tin Oxide (ITO) as the cathode on which a diamino derivative and tris(8-hydroxyquinoline)aluminum are deposited in sequence, and comprises a magnesium/silver alloy as the anode material. Such a multilayer structure can reduce the driving voltage of the OLED device, and effectively improve the charge injection at the interface between the material molecules and the electrode, thereby improving the device performance and lifetime.

Compared with traditional technologies, the OLED devices have many advantages such as low driving voltage, high luminescence efficiency, high contrast, high color saturation, wide viewing angle, and fast response time. The current OLED device comprises a plurality of a hole injection layer, a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, and suitable electrodes in combination. The plurality of layers is respectively formed of a hole injection material, a hole transport material, a light emitting material, a hole blocking material, an electron transport material, and an electron injection material. A light-emitting layer of the OLED device that is fabricated by doping is advantageous in the luminescence efficiency of the device. Therefore, the material for the light-emitting layer is often formed by doping a host material with a guest material, and the host material is an important factor affecting the luminescence efficiency and performance of the OLED device. 4,4′-Bis(9H-carbazol-9-yl)biphenyl (CBP) is a widely used host material with good hole transport performance. However, when CBP is used as a host material, it is prone to recrystallization due to its low glass transition temperature, resulting in reduced performance and luminescence efficiency of OLED devices. Moreover, an increase in the molecular weight of the material can increase the glass transition temperature and thermal stability of the material, but reduce the triplet energy level of the material at the same time, affecting the lifetime and luminescence efficiency of the device.

SUMMARY

An object of the present invention is to overcome the defects existing in the prior art that the host material in the light emitting layer has low glass transition temperature, tendency to crystallization, poor thermal stability, and inability to have both good thermal stability and high triplet energy level.

To achieve the above object, the following technical solutions are adopted in the present invention.

A fused polycyclic compound has a structure shown below:

where the phenyl ring is attached to

at positions 1 and 2, positions 2 and 3, or positions 3 and 4 to form a fused ring sharing the same side, in which “

” and “

” denotes the points of attachment, in which

when the phenyl ring is attached to

at positions 3 and 4 to form a fused ring sharing the same side, the General Formula IV has a structure below:

when the phenyl ring is attached to

at positions 2 and 3 to form a fused ring sharing the same side, the General Formula IV has a structure below:

and

when the phenyl ring is attached to

at positions 1 and 2 to form a fused ring sharing the same side, the General Formula IV has a structure below:

T¹ is independently selected from a single bond, NR¹⁵, S, O, BR¹⁵, PR¹⁵, and C(R¹⁵)₂, in which R¹⁵ is the same or different, and is each independently selected from methyl, deuterated methyl, phenyl, deuterated phenyl, biphenylyl, deuterated biphenylyl, naphthalenyl, and deuterated naphthalenyl;

at least one of T² and T³ is a single bond, when T² is a single bond, T³ is S or O, and when T³ is a single bond, T² is S or O; and

R¹-R¹⁴ are the same or different, and are each independently selected from hydrogen, deuterium, methyl, deuterated methyl, phenyl, deuterated phenyl, and deuterated methyl substituted phenyl.

Further, R¹-R¹⁴ are the same or different, at least one of which is one selected from deuterium, deuterated methyl, deuterated phenyl, and deuterated methyl substituted phenyl.

Further, R¹-R⁴ are the same or different, and at least one of them is hydrogen; and/or

R⁵-R⁸ are the same or different, and at least one of them is hydrogen; and/or

R⁹-R¹⁴ are the same or different, and at least one of them is hydrogen; and preferably at least one of R¹¹-R¹⁴ is hydrogen.

Further, when T² is a single bond, T³ is S or O.

preferably, when T² is a single bond, T³ is S.

Further, the compound has a structure shown below:

Further, the fused polycyclic compound has any one of the following structures:

The present invention also provides a method for preparing the fused polycyclic compound.

When T¹ is selected from C(R¹⁵)₂, that is, the fused polycyclic compound has a structure of General Formula IV-1, and T⁴ is selected from Cl C(R¹⁵)₂ or Br C(R¹⁵)₂, the preparation method comprises:

subjecting the compound of Formula (E) used as a raw material to a cyclization reaction in the presence of a catalyst to obtain an intermediate compound (F); and coupling the intermediate compound (F) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-1.

The route for preparing the compound of General Formula IV-1 is shown below:

Alternatively, when T¹ is selected from BR¹⁵, that is, the fused polycyclic compound has a structure of General Formula IV-2, and T⁴ is selected from hydrogen, the preparation method comprises:

reacting the compound of Formula (E) used as a raw material with the compound of Formula (H) in the presence of a catalyst to obtain an intermediate compound (J); and coupling the intermediate compound (J) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-2.

The route for preparing the compound of General Formula IV-2 is shown below:

Alternatively, when T¹ is selected from O, that is, the fused polycyclic compound has a structure of General Formula IV-3, and T⁴ is selected from hydroxyl, the preparation method comprises:

reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (K); and coupling the intermediate compound (K) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-3.

The route for preparing the compound of General Formula IV-3 is shown below:

Alternatively, when T¹ is selected from S, that is, the fused polycyclic compound has a structure of General Formula IV-4, and T⁴ is selected from mercapto, the preparation method comprises:

reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (K-1); and coupling the intermediate compound (K-1) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-4.

The route for preparing the compound of General Formula IV-4 is shown below:

Alternatively, when T¹ is selected from PR, that is, the fused polycyclic compound has a structure of General Formula IV-5, and T⁴ is selected from hydrogen, the preparation method comprises:

reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (L); reacting the intermediate compound (L) in the presence of a catalyst to obtain an intermediate compound (M); coupling the intermediate compound (M) to the compound of Formula (N) in the presence of a catalyst to obtain an intermediate compound (O); and coupling the intermediate compound (O) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-5.

The route for preparing the compound of General Formula IV-5 is shown below:

Alternatively, when T¹ is selected from NR¹⁵, that is, the fused polycyclic compound has a structure of General Formula IV-6, and T⁴ is selected from nitro, the preparation method comprises:

reacting the compound of Formula (D) used as a raw material in the presence of a catalyst to obtain an intermediate compound (P); and reacting the intermediate compound (P) with the compound of Formula (Q) and then the compound of Formula (G), to obtain the compound of General Formula IV-6.

The route for preparing the compound of General Formula IV-6 is shown below:

Alternatively, when T¹ is selected from a single bond, that is, the fused polycyclic compound has a structure of General Formula IV-7, the preparation method comprises:

reacting the compound of Formula (R) used as a raw material with the compound of Formula (S) in the presence of a catalyst to obtain an intermediate compound (T); subjecting the intermediate compound (T) to a cyclization reaction in the presence of a catalyst to obtain an intermediate compound (U); and coupling the intermediate compound (U) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of General Formula IV-7.

The route for preparing the compound of General Formula IV-7 is shown below:

where W is selected from fluoro, chloro, bromo, and iodo.

Further, the compound of Formula (E) is prepared through a method comprising:

nitrifying the compound of Formula (A) used as a starting raw material in the presence of a catalyst to obtain an intermediate compound (B); coupling the intermediate compound (B) to the compound of Formula (C) in the presence of a catalyst to obtain an intermediate compound (D); and reducing the intermediate compound (D) in the presence of a catalyst, to obtain the compound of Formula E.

The route for preparing the compound of Formula E is shown below:

The present invention also provides an electronic device, which comprises any one or a combination of at least two of the fused polycyclic compounds described above.

Preferably, the electronic device is any one of an organic light emitting diode, an organic field effect transistor, an organic thin film transistor, an organic light emitting transistor, an organic integrated circuit, an organic solar cell, an organic field quenching device, a light emitting electrochemical cell, an organic laser diode or an organic photoreceptor.

Further, the electronic device is an organic light emitting device comprising an anode, a cathode, and an organic thin film layer between the anode and the cathode, where the organic thin film layer comprises any one or a combination of at least two of the fused polycyclic compounds described above.

Preferably, the organic thin film layer comprises a light-emitting layer, and also any one or a combination of at least two of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer, an electron blocking layer, and a charge transport layer, where the light-emitting layer comprises any one or a combination of at least two of the fused polycyclic compounds described above.

Preferably, the light-emitting layer comprises a host material and a guest material; and the host material in the light-emitting layer comprises any one or a combination of at least two of the fused polycyclic compounds described above.

The present invention further provides a display device comprising the electronic device described above.

The present invention also provides a lighting device comprising the electronic device described above.

The present invention has the following beneficial effects.

1) The fused polycyclic compound provided in the present invention has a structure of General Formula IV. The structure of the compound has ambipolarity, the HOMO level and the LUMO level of the host material can be respectively located on different electron donating group and electron withdrawing group, such that the transport of charges and holes in the host material becomes more balanced, thereby expanding the area where holes and electrons are recombined in the light emitting layer, reducing the exciton concentration, preventing the triplet-triplet annihilation of the device, and improving the efficiency of the device.

Meanwhile, in the structure of General Formula IV, by attaching the phenyl ring to

at the positions 1 and 2, 2 and 3, or 3 and 4 to form a fused ring sharing the same side, the structure of the compound is more highly conjugated, more stable in the excited state, and more rigid, so the stability of the material is higher, which is beneficial to the extension of the lifetime of the device. Moreover, the particular structure of the compound further facilitates the carrier recombination region in the host material of the OLED device to stay far away from the interface of the light emitting layer to the hole or electron transport layer, thus improving the color purity of the OLED device, avoiding the returning of excitons to the transport layer, and further improving the efficiency of the device

The HOMO level and the LUMO level of the fused polycyclic compound according to the present invention match those of the adjacent hole transport layer and electron transport layer, so that the OLED device has a small driving voltage. Furthermore, the compound, used as the host material in the light emitting layer of the OLED device, has high triplet energy level and good thermal stability, which ensures the efficient transfer of energy from the host material to the guest material and prevents the crystallization of the material molecules of the light emitting layer.

The compound of the present invention has a small difference between the singlet (ΔE_(S1)) and triplet energy level (

E_(T1)), which promotes the reverse intersystem crossing of triplet excitons to singlet excitons. Moreover, the high reverse intersystem crossing (RISC) rate from the triplet state T1 to the singlet state S of the hot material can suppress the Dexter energy transfer (DET) from the host material to the luminescent dye, promote the FÖrster energy transfer, and reduce the exciton loss generated during the Dexter energy transfer (DET), thus avoiding the efficiency roll-off of the organic light-emitting device and improving the external quantum efficiency of the device, thereby achieving a high device efficiency.

2) Further, in the fused polycyclic compound provided in the present invention, R¹-R¹⁴ are the same or different, at least one of which is one selected from deuterium, deuterated methyl, deuterated phenyl, and deuterated methyl substituted phenyl. By the use of deuterium having lower potential well, lower vibration frequency, smaller amplitude and more stable carbon-deuterium bond, the luminescence efficiency and the service life of the organic light emitting device are improved. In the present invention, by defining that R¹-R⁴ are the same or different, and at least one of them is hydrogen; and/or R⁵-R⁸ are the same or different, and at least one of them is hydrogen; and/or R¹¹-R¹⁴ are the same or different, and at least one of them is hydrogen, the substituents on the structure

are not all substituted with deuterium, and the structure interacts with the structure

which further facilitates the improvement of the service life of the device.

3) According to the organic light emitting device (OLED) provided in the present invention, the host material in the light-emitting layer comprises any one or a combination of at least two of the fused polycyclic compounds described above. As a host material in the light-emitting layer, the particular fused polycyclic compound allows the transport of charges and holes in the host material to become more balanced, thereby expanding the area where holes and electrons are recombined in the light emitting layer, reducing the exciton concentration, preventing the triplet-triplet annihilation of the device, and improving the efficiency of the device.

Moreover, the particular structure of the compound further facilitates the carrier recombination region in the host material of the OLED device to stay far away from the interface of the light emitting layer to the hole or electron transport layer, thus improving the color purity of the OLED device, avoiding the returning of excitons to the transport layer, and further improving the efficiency of the device

The HOMO level and the LUMO level of the fused polycyclic compound according to the present invention match those of the adjacent hole transport layer and electron transport layer, so that the OLED device has a small driving voltage. Furthermore, the compound, used as the host material in the light emitting layer of the OLED device, has high triplet energy level and glass transition temperature, and good thermal stability, which ensures the efficient transfer of energy from the host material to the guest material and prevents the crystallization of the material molecules of the light emitting layer.

The compound of the present invention has a high singlet energy level, ensuring efficient energy transfer from the host material to the guest material; and has a small difference between the singlet (

E_(S1)) and triplet energy level (

E_(T1)), which promotes the reverse intersystem crossing of triplet excitons to singlet excitons. Moreover, the high reverse intersystem crossing (RISC) rate from the triplet state T1 to the singlet state S1 of the hot material can suppress the Dexter energy transfer (DET) from the host material to the luminescent dye, promote the FÖrster energy transfer, and reduce the exciton loss generated during the Dexter energy transfer (DET), thus avoiding the efficiency roll-off of the organic light-emitting device and improving the external quantum efficiency of the device, thereby achieving a high device efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the technical solutions in the specific embodiments of the present invention or in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly described below. Obviously, the drawings depicted below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

FIG. 1 is a schematic structural view of an organic light emitting device according to Examples 1 to 11 and Comparative Examples 1 to 2 of the present invention.

LIST OF REFERENCE NUMERALS

-   -   1—anode, 2—hole injection layer, 3—hole transport layer,         4—organic light-emitting layer, 5—electron transport layer,         6—electron injection layer, 7—cathode.

DETAILED DESCRIPTION

The following examples are provided for better understanding of the present invention, which however are not restricted to the preferred embodiments, and not intended to limit the disclosure and protection scope of the present invention. Products that are the same as or similar to the present invention obtained by any skilled person with the suggestion of the present invention or by combining the present invention with other features in the prior art will fall within the protection scope of the present invention.

Where no specific experimental steps or conditions are indicated in the examples, the operation or conditions in the conventional experimental procedures described in the literatures in the art are followed. The reagents or instruments for which no manufacturers are noted are all common reagents and products commercially available from the market.

Example 1

This example provides a route for synthesizing a fused polycyclic compound 10.

The compound 10 was prepared through a method comprising specifically the following steps.

1) Synthesis of intermediate 1-10: To a three-neck flask, acetic acid (500 mL), and then the compound N3 (72.0 g, 0.20 mol) were added, and then 65 wt % concentrated nitric acid (20.3 g, 0.21 mol) was added dropwise at 0° C., and then stirred at 0° C. for 2 hrs. The reaction solution was poured into iced water (800 mL), neutralized with sodium hydroxide to pH=6-7, and then extracted with ethyl acetate (500 mL×2). The organic phases were combined, washed with saturated brine (200 ml×2), and dried over sodium sulfate. The organic phase was rotary dried to obtain a product (78.2 g). The product was purified by column chromatography (PE:EA=20:1-5:1) to obtain the intermediate 1-10 (63.5 g, yield 78.4%).

2) Synthesis of intermediate 2-10: To a three-neck flask, the intermediate 1-10 (40.5 g, 0.10 mol), the compound N4 (29.3 g, 0.10 mol), potassium carbonate (27.6 g, 0.20 mol), and tetrahydrofuran-water (tetrahydrofuran/water volume ratio 3:1, 400 mL) were added. Tetrakis(triphenylphosphine)palladium (1.0 g) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 75° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, taken up in water (200 mL), and extracted with ethyl acetate (200 mL×2). The organic phase was rotary dried to obtain a crude product. The crude product was purified by column chromatography (PE:EA=10:1−5:1), to obtain the intermediate 2-10 (38.9 g, yield 74%).

3) Synthesis of intermediate 3-10: The intermediate 2-10 (26.3 g, 0.050 mol) was added to acetic acid (200 mL), and then iron powder (14 g, 0.25 mol) was added, and stirred at room temperature for 2 hrs. The iron powder was filtered off, and the acetic acid was removed by rotary drying, to obtain a crude product. The crude product was purified by column chromatography (PE:EA=5:1−3:1), to obtain the intermediate 3-10 (19.7 g, yield 91.2%).

4) Synthesis of intermediate 4-10: To a three-neck flask, the intermediate 3-10 (13.0 g, 0.030 mol), xylene (120 mL), a 10 wt % tri-tert-butylphosphine solution in xylene (6.0 g, 4 mol %, where in the tri-tert-butylphosphine solution in xylene, tri-tert-butylphosphine was a solute and xylene was a solvent), and sodium tert-butoxide (5.77 g, 0.060 mol) were added. Pd₂(dba)₃ (300 mg, 2.0 mol) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 140° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled to room temperature, and xylene was removed by rotary drying. The residue was directly purified by column chromatography (PE:EA=5:1−2:1), to obtain the intermediate 4-10 (9.7 g, yield 77.8%).

5) Synthesis of compound 10: To a three-neck flask, the intermediate 4-10 (8.3 g, 0.020 mol), the compound N1 (7.2 g, 0.030 mol), sodium tert-butoxide (3.85 g, 0.040 mol), xphos (400 mg), and xylene (60 mL) were added. Tetrakis(triphenylphosphine)palladium (200 mg) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 140° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, and the organic phase was rotary dried. The residue was purified by column chromatography (PE:EA=4:1−2:1) to obtain a crude product, which was slurried three times each in xylene and tetrahydrofuran (100 mL×6), to obtain the compound 10 (6.9 g, yield 56%).

Element analysis: (C₄₃H₂₈DN₃S) calculated: C, 83.20; H, 4.87; N, 6.77; S, 5.16. found: C, 83.23; H, 4.86; N, 6.76; S, 5.15; HRMS (ESI) m/z (M⁺): calculated: 620.2145. found: 620.2151.

Example 2

This example provides a route for synthesizing a fused polycyclic compound 11.

The compound 11 was prepared through a method comprising specifically the following steps.

1) Synthesis of intermediate 1-11: The synthesis method was the same as that for the intermediate 1-10, except that the compound N5 (72 g, 0.2 mol) was used in place of the compound N3, to obtain the intermediate 1-11 (63.2 g, yield 78%).

2) Synthesis of intermediate 2-11: The synthesis method was the same as that for the intermediate 2-10, except that the intermediate 1-11 (40.49 g, 0.1 mol) was used in place of the intermediate 1-10, and the compound N2 (30.9 g, 0.1 mol) was used in place of the compound N4 to obtain the intermediate 2-11 (40.2 g, yield 74.1%).

3) Synthesis of intermediate 3-11: The synthesis method was the same as that for the intermediate 3-10, except that the intermediate 2-11 (27.1 g, 0.05 mol) was used in place of the intermediate 2-10, to obtain the intermediate 3-11 (20.6 g, yield 91.8%).

4) Synthesis of intermediate 4-11: The synthesis method was the same as that for the intermediate 4-10, except that the intermediate 3-11 (13.4 g, 0.03 mol) was used in place of the intermediate 3-10, to obtain the intermediate 4-11 (9.8 g, yield 75.5%).

5) Synthesis of compound 11: The synthesis method was the same as that for the compound 10, except that the intermediate 4-11 (8.64 g, 0.02 mol) was used in place of the intermediate 4-10, to obtain the compound 11 (8.1 g, yield 64%).

Element analysis: (C₄₄H₂₈D₃N₃S) calculated: C, 82.99; H, 5.38; N, 6.60; S, 5.03. found: C, 82.97; H, 5.38; N, 6.61; S, 5.03; HRMS (ESI) m/z (M⁺): calculated: 636.2427. found: 636.2433.

Example 3

This example provides a route for synthesizing a fused polycyclic compound 14.

The compound 14 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N6: The synthesis method was the same as that for the intermediate 1-11, except that the compound

was used in place of the compound N5, and the yield was 74%.

The synthesis route for the compound N6 was shown below:

2) Synthesis of intermediate 1-14: A stir bar was placed in a 500 ml two-neck round-bottom flask, and then a reflux pipe was connected. Next, the two-neck round-bottom flask was dried and filled with nitrogen. To the two-neck round-bottom flask, the compound N6 (30.2 g, 1.2 eq., 0.12 mol), the compound N7 (27.8 g, 1.0 eq., 0.1 mol), potassium carbonate (27.6 g, 2 eq., 0.2 mol), and tetrahydrofuran-water (tetrahydrofuran/water volume ratio 3:1, 200 mL) were added. Tetrakis(triphenylphosphine)palladium (6 mmol) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 75° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, taken up in water (150 mL), and extracted with ethyl acetate (150 mL×2). The organic phase was rotary dried to obtain a crude product. The crude product was purified by column chromatography (PE:EA=20:1−8:1), to obtain the intermediate 1-14 as a yellow solid (32.9 g, yield 81%).

3) Synthesis of intermediate 2-14: A stir bar was placed in a 500 ml two-neck round-bottom flask, and then a reflux pipe was connected. Next, the two-neck round-bottom flask was dried and filled with nitrogen. To the two-neck round-bottom flask, the intermediate 1-14 (40.6 g, 1 eq., 0.1 mol) and triethyl phosphite (250 mL) were respectively added and stirred at 120° C. for 16 hrs. The reaction solution was cooled, rotary dried to remove the solvent, added with water (200 mL), and then extracted with ethyl acetate (200 mL×2). The organic phases were combined, washed with saturated saline, dried over sodium sulfate, and rotary dried to obtain a crude product (41.5 g). The crude product was purified by column chromatography (PE:EA=10:1−5:1), and then rotary dried to obtain the intermediate 2-14 (30.5 g, yield 81.5%).

4) Synthesis of compound 14: A stir bar was placed in a 500 ml two-neck round-bottom flask, and then a reflux pipe was connected. Next, the two-neck round-bottom flask was dried and filled with nitrogen. To the two-neck round-bottom flask, the compound N1 (24 g, 1 eq., 0.1 mol), the intermediate 2-14 (37.3 g, 1 eq.), tert-BuNa (sodium tert-butoxide, 3 eq.), xylene (120 ml), xphos (1 g), and Pd[PPh₃]₄ (tetrakis(triphenylphosphine)palladium, 0.05 eq., 5 mmol) were respectively added. The reaction system was stirred at 140° C. for 5 hrs, and then cooled to room temperature after reaction. The reaction system was filtered, and the filtrate was concentrated to obtain a crude product. The crude product was purified by chromatography (ethyl acetate/hexane, volume ratio 1/10), to obtain the compound 14 (42.2 g, yield 73%).

Element analysis: C₄₀H₂₂DN₃S calculated: C, 83.02; H, 4.18; N, 7.26. found: C, 83.05; H, 4.16; N, 7.25; HRMS (ESI) m/z (M+): calculated: 578.1675. found: 578.1681.

Example 4

This example provides a route for synthesizing a fused polycyclic compound 26.

The compound 26 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N9: The synthesis method was the same as that for the intermediate 1-11, except that the compound

was used in place of the compound N5, and the yield was 73%.

The synthesis route for the compound N9 was shown below:

2) Synthesis of intermediate 1-26: To a three-neck flask, the compound N9 (81.0 g, 0.20 mol), 2-mercapto-1-naphthaleneboronic acid (the compound N10, 49.0 g, 0.24 mol), potassium carbonate (55.2 g, 0.40 mol), and tetrahydrofuran-water (tetrahydrofuran/water volume ratio 3:1, 600 mL) were added. Tetrakis(triphenylphosphine)palladium (0.01 mol) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 75° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, taken up in water (300 mL), and extracted with ethyl acetate (300 mL×2). The organic phase was rotary dried to obtain a crude product. The crude product was purified by column chromatography (PE:EA=8:1−3:1), to obtain the intermediate 1-26 (61.3 g, yield 70%).

3) Synthesis of intermediate 2-26: The intermediate 1-26 (43.8 g, 0.10 mol) was added to acetic acid (300 mL), and then iron powder (28 g, 0.50 mol) was added, and stirred at room temperature for 2 hrs. The iron powder was filtered off, and the acetic acid was removed by rotary drying, to obtain a crude product (62 g). The crude product was purified by column chromatography (PE:EA=5:1−2:1), to obtain the intermediate 2-26 (36.8 g, yield 90.2%).

4) Synthesis of intermediate 3-26: The intermediate 2-26 (20.4 g, 0.050 mol) was dissolved in DMF (100 mL) in a three-neck flask, and then potassium bromide (1.19 g, 0.010 mol) was added and reacted at 110° C. for 12 hrs. The reaction solution was cooled, rotary dried to remove the solvent, diluted with water (100 mL), and extracted with ethyl acetate (100 mL×2). The organic phases were combined, washed with saturated saline (100 mL×2), and dried over sodium sulfate. The solvent was removed by rotary dried, and a crude product 3-26 was obtained, which was purified by column chromatography (PE:EA=3:1−1:1), and rotary dried to obtain the intermediate 3-26 (13.0 g, yield 64%).

5) Synthesis of compound 26: To a three-neck flask, the intermediate 3-26 (8.1 g, 0.020 mol), the compound N1 (7.2 g, 0.030 mol), sodium tert-butoxide (3.85 g, 0.040 mol), xphos (400 mg), and xylene (60 mL) were added. Tetrakis(triphenylphosphine)palladium (1 mmol) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 140° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, and the organic phase was rotary dried. The residue was purified by column chromatography (PE:EA=4:1−2:1) to obtain a crude product of the compound 26, which was slurried three times each in xylene and tetrahydrofuran (80 mL×6), to obtain the compound 26 (7.8 g, yield 64%).

Element analysis: C₄₀H₂₂DN₃S₂ calculated: C, 78.66; H, 3.96; N, 6.88. found: C, 78.64; H, 3.96; N, 6.89; HRMS (ESI) m/z (M+): calculated: 610.1396. found: 610.1400.

Example 5

This example provides a route for synthesizing a fused polycyclic compound 74.

The compound 74 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N11: The synthesis method was the same as that for the intermediate 1-11, except that the compound

was used in place of the compound N5, and the yield was 70%.

The synthesis route for the compound N11 was shown below:

2) Synthesis of intermediate 1-74: To a three-neck flask, the compound N11 (39.0 g, 0.10 mol), the compound N12 (21.7 g, 0.10 mol), potassium carbonate (27.6 g, 0.20 mol), and tetrahydrofuran-water (tetrahydrofuran/water volume ratio 3:1, 400 mL) were added. Tetrakis(triphenylphosphine)palladium (1.0 g) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 75° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, taken up in water (200 mL), and extracted with ethyl acetate (200 mL×2). The organic phase was rotary dried to obtain a crude product. The crude product was purified by column chromatography (PE:EA=20:1−10:1), to obtain the intermediate 1-74 (32.2 g, yield 74%).

3) Synthesis of intermediate 2-74: To a three-neck flask, the intermediate 1-74 (21.7 g, 0.05 mol) was added, isopropanol (200 mL) was added to dissolve the intermediate, and then titania (8.0 g, 0.10 mol) was added. Under a nitrogen atmosphere, the reaction was continued for 16 hrs under UV irradiation. The solvent was rotary dried, and the residue was purified by column chromatography (PE:EA=15:1−5:1) to obtain the intermediate 2-74 (12.6 g, yield 68%).

4) Synthesis of compound 74: To a three-neck flask, the intermediate 2-74 (7.4 g, 0.02 mol) was added, and then anhydrous tetrahydrofuran (50 mL) was added, and cooled to −78° C. Phenyl lithium (20 mL, 0.02 mol) was added dropwise and stirred for 2 hrs while the temperature was maintained at −78° C. Then a solution of the compound N1 (4.8 g, 0.02 mol) in tetrahydrofuran (30 mL) was added dropwise. After the addition, the mixture was incubated at −78° C. for 2 hrs and then allowed to warm to room temperature overnight. The reaction solution was quenched with water (100 mL), extracted with ethyl acetate (100 mL×2), washed with saturated saline, dried over sodium sulfate, and rotary dried to obtain a crude product, which was purified by column chromatography (PE:EA=7:1−3:1), to obtain the compound 74 (8.2 g, yield 63%).

Element analysis: C₄₆H₂₇DN₄₀ calculated: C, 84.51; H, 4.47; N, 8.57. found: C, 84.54; H, 4.48; N, 8.58; HRMS (ESI) m/z (M+): calculated: 653.2326. found: 653.2331.

Example 6

This example provides a route for synthesizing a fused polycyclic compound 76.

The compound 76 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N13: The synthesis method was the same as that for the intermediate 1-11, except that the compound

was used in place of the compound N5, and the yield was 71%.

The synthesis route for the compound N13 was shown below:

2) Synthesis of intermediate 1-76: The synthesis method was the same as that for the intermediate 1-74, except that the compound N14 (21.8 g, 1 eq., 0.1 mol) was used in place of the compound N12, to obtain the intermediate 1-76 (32.1 g, yield 71%).

3) Synthesis of intermediate 2-76: The synthesis method was the same as that for the intermediate 2-74, except that the intermediate 1-76 (22.6 g, 0.05 mol) was used in place of the intermediate 1-74, to obtain the intermediate 2-76 (11.6 g, yield 60%).

4) Synthesis of compound 76: The synthesis method was the same as that for the compound 74, except that the intermediate 2-76 (7.76 g, 0.02 mol) was used in place of the intermediate 2-74, to obtain the compound 76 (7.9 g, yield 59%).

Element analysis: C₄₆H₂₆D₂N₄S calculated: C, 82.36; H, 4.51; N, 8.35; S, 4.78. found: C, 82.39; H, 4.50; N, 8.34; S, 4.77; HRMS (ESI) m/z (M+): calculated: 670.2160. found: 670.2165.

Example 7

This example provides a route for synthesizing a fused polycyclic compound 92.

The compound 92 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N15: The synthesis method was the same as that for the intermediate 2-26, except that

was used in place of the compound N9, and

was used in place of the compound N10

and the final yield was 52%.

The synthesis route for the compound N15 was shown below:

2) Synthesis of intermediate 2-92: To a three-neck flask, the compound N15 (75.1 g, 0.20 mol), and then benzene (500 mL) and anhydrous phosphorus trichloride (27.5 g, 0.2 mol) were added, and refluxed for 16 hrs under a nitrogen atmosphere. The reaction solution was cooled, rotary dried to remove the benzene, and then added with anhydrous aluminum trichloride (3.1 g, 0.02 mol). The reaction mixture was reacted at 180° C. for 5 hrs, cooled, and purified by column chromatography (PE:EA=5:1−3:1), to obtain the intermediate 2-92 (61.4 g, yield 69.8%).

3) Synthesis of intermediate 3-92: To a three-neck flask, the intermediate 2-92 (44.0 g, 0.10 mol), and then anhydrous tetrahydrofuran (300 mL) were added. Under a nitrogen atmosphere, the phenyl grignard reagent (150 mL, 0.30 mol) was added dropwise at 0° C. After addition, the system was stirred at room temperature for 12 hrs, refluxed for 2 hrs, cooled, poured into iced water (300 mL), and adjusted to a neutral pH with 5 wt % hydrochloric acid. The reaction solution was extracted with dichloromethane (200 mL×2), and the organic phase was washed with saturated saline (200 mL), dried over sodium sulfate, and rotary dried to obtain a crude product. The crude product was recrystallized in diethyl ether:dichloromethane (volume ratio 1:1, 400 mL), to obtain the intermediate 3-92 (31.1 g, yield 64.6%).

4) Synthesis of compound 92: To a three-neck flask, the intermediate 3-92 (9.6 g, 0.020 mol), the compound N1 (7.2 g, 0.030 mol), sodium tert-butoxide (3.9 g, 0.040 mol), xphos (400 mg), and xylene (60 mL) were added. Tetrakis(triphenylphosphine)palladium (200 mg) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 140° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, and the organic phase was rotary dried. The residue was purified by column chromatography (PE:EA=8:1−4:1) to obtain a crude product of the compound 92, which was slurried three times each in xylene and tetrahydrofuran (80 mL×6), to obtain the compound 92 (7.3 g, yield 53.2%).

Element analysis: (C₄₆H₂₇DN₃PS) calculated: C, 80.45; H, 4.26; N, 6.12; S, 4.67. found: C, 80.48; H, 4.26; N, 6.12; S, 4.65; HRMS (ESI) m/z (M+): calculated: 686.1804. found: 686.1799.

Example 8

This example provides a route for synthesizing a fused polycyclic compound 95.

The compound 95 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N16: The synthesis method was the same as that for the intermediate 2-26, except that the compound

was used in place of the compound N10

and the final yield was 56%.

The synthesis route for the compound N16 was shown below:

2) Synthesis of intermediate 2-95: The synthesis method was the same as that for the intermediate 2-92, except that the compound N16 (75 g, 0.20 mol) was used in place of the compound N15, to obtain the intermediate 2-95 (63.0 g, yield 71.8%).

3) Synthesis of intermediate 3-95: The synthesis method was the same as that for the intermediate 3-92, except that the intermediate 2-95 (43.9 g, 0.1 mol) was used in place of the intermediate 2-92, to obtain the intermediate 3-95 (29.4 g, yield 61.2%).

4) Synthesis of compound 95: The synthesis method was the same as that for the compound 92, except that the intermediate 3-95 (9.6 g, 0.02 mol) was used in place of the intermediate 3-92, to obtain the compound 95 (7.9 g, yield 57.8%).

Element analysis: (C₄₇H₂₇D₃N₃PS) calculated: C, 80.32; H, 4.73; N, 5.98; S, 4.56. found: C, 80.36; H, 4.72; N, 5.96; S, 4.55; HRMS (ESI) m/z (M⁺): calculated: 702.2086. found: 702.2091.

Example 9

This example provides a route for synthesizing a fused polycyclic compound 111.

The compound 111 was prepared through a method comprising specifically the following steps.

1) Synthesis of intermediate 1-111: To a three-neck flask, the compound N19 (81.0 g, 0.20 mol), N20 (41.3 g, 0.24 mol), potassium carbonate (55.2 g, 0.40 mol), and tetrahydrofuran-water (tetrahydrofuran/water volume ratio 3:1, 500 mL) were added. Tetrakis(triphenylphosphine)palladium (2.0 g) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 75° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, and extracted. The organic phase was rotary dried to obtain a crude product. The crude product was purified by column chromatography (PE:EA=10:1−5:1), to obtain the intermediate 1-111 (61 g, yield 75.1%).

2) Synthesis of intermediate 2-111: The intermediate 1-111 (40.6 g, 0.10 mol) was added to acetic acid (300 mL), and then iron powder (28 g, 0.50 mol) was added, and stirred at room temperature for 2 hrs. The iron powder was filtered off, and the acetic acid was removed by rotary drying, to obtain a crude product (50 g). The crude product was purified by column chromatography (PE:EA=5:1−3:1), to obtain the intermediate 2-111 (34.7 g, yield 92.3%).

3) Synthesis of intermediate 3-111: To a three-neck flask, the intermediate 2-111 (18.8 g, 0.05 mol), phenylboron dichloride (9.5 g, 0.06 mol), anhydrous toluene (150 mL), and aluminum trichloride (10.0 g, 0.08 mol) were added. Under a nitrogen atmosphere, the mixture was refluxed in toluene for 4 hrs, cooled, and filtered. The filtrate was washed with saturated brine (100 mL), rotary dried, and slurried twice in toluene (100 mL×2), to obtain the intermediate 3-111 (15.2 g, 66%).

4) Synthesis of compound 111: To a three-neck flask, the intermediate 3-111 (9.2 g, 0.020 mol), the compound N1 (7.22 g, 0.030 mol), sodium tert-butoxide (3.9 g, 0.040 mol), xphos (400 mg), and xylene (60 mL) were added. Tetrakis(triphenylphosphine)palladium (200 mg) was then added under a nitrogen atmosphere. Subsequently, the reaction was heated to 140° C. and stirred for 4 hrs under a nitrogen atmosphere. The reaction solution was cooled, and the organic phase was rotary dried. The residue was purified by column chromatography (PE:EA=4:1−2:1) to obtain a crude product, which was slurried three times each in xylene and tetrahydrofuran (80 mL×6), to obtain the compound 111 (8.1 g, yield 60.6%).

Element analysis: (C₄₆H₂₇DBN₃S) calculated: C, 82.88; H, 4.38; N, 6.30; S, 4.81. found: C, 82.90; H, 4.38; N, 6.29; S, 4.80; HRMS (ESI) m/z (M⁺): calculated: 666.2160. found: 666.2166.

Example 10

This example provides a route for synthesizing a fused polycyclic compound 107.

The compound 107 was prepared through a method comprising specifically the following steps.

1) Synthesis of compound N17: The synthesis method was the same as that for the intermediate 1-11, except that the compound

was used in place of the compound N5, and the yield was 73%.

2) Synthesis of intermediate 1-107: The synthesis method was the same as that for the intermediate 1-111, except that the compound N17 (77.8 g, 0.20 mol) was used in place of the compound N19, and the compound N18 was used in place of the compound N20, to obtain the intermediate 1-107 (56.8 g, yield 73.0%).

3) Synthesis of intermediate 2-107: The synthesis method was the same as that for the intermediate 2-111, except that the intermediate 1-107 (38.9 g, 0.01 mol) was used in place of the intermediate 1-111, to obtain the intermediate 2-107 (33.5 g, yield 93.2%).

4) Synthesis of intermediate 3-107: The synthesis method was the same as that for the intermediate 3-111, except that the intermediate 2-107 (18.0 g, 0.05 mol) was used in place of the intermediate 2-111, to obtain the intermediate 3-107 (14.9 g, yield 67%).

5) Synthesis of compound 107: The synthesis method was the same as that for the compound 111, except that the intermediate 3-107 (8.9 g, 0.02 mol) was used in place of the intermediate 3-111, to obtain the compound 107 (8.2 g, yield 63.0%).

Element analysis: (C₄₆H₂₇DBN₃₀) calculated: C, 84.93; H, 4.49; N, 6.46. found: C, 84.97; H, 4.49; N, 6.45; HRMS (ESI) m/z (M⁺): calculated: 650.2388. found: 650.2393.

Example 11

This example provides a route for synthesizing a fused polycyclic compound 133.

The preparation method of the compound 133 was the same as that for the compound 14, except that the intermediate 2 was used in place of the intermediate 2-14, and the compound 133 was obtained with a yield of 66%.

Element analysis: C₄₀H₂₃N₃S calculated: C, 83.16; H, 4.01; N, 7.27; S, 5.55. found: C, 83.19; H, 4.01; N, 7.25; S, 5.54; HRMS (ESI) m/z (M+): calculated: 577.1613. found: 577.1619.

Device Example 1

This example provides an organic light-emitting device, which includes, from bottom to top, an anode 1, a hole injection layer 2, a hole transport layer 3, a light emitting layer 4, an electron transport layer 5, an electron injection layer 6 and a cathode 7 stacked in sequence. The device is configured to have a particular structure of ITO/hole injection layer (HIL) (30 nm)/hole transport layer (HTL) (40 nm)/organic light-emitting layer (compound 10 doped with compound RD) (40 nm)/electron transport layer (ETL) (40 nm)/electron injection layer (EIL/LiF) (1 nm)/cathode (Al) (150 nm) as shown in FIG. 1 .

In the organic light-emitting device, the material of the anode 1 is ITO.

The material of the hole injection layer 2 is the compound HAT(CN)₆ having a structure below:

The material of the hole transport layer 3 is the compound NPB having a structure below:

The organic light emitting layer 4 is formed by blending a host material and a guest material, where the host material is the compound 10, and the guest material is the compound RD; the host material and the guest material are blended at a weight ratio of 100:5; and the compound RD has a chemical structure shown below:

The material of the electron transport layer 5 is the compound CBP having a structure below:

The material of the electron injection layer 6 is formed by the compound BCP having a structure below, blended with the electron injection material LiF, where BCP and LiF are blended at a weight ratio of 100:3:

The material of the cathode 7 is the metal Al.

The organic light emitting device was fabricated through a process comprising the following steps.

1) Cleaning of Substrate:

A glass substrate coated with an ITO transparent electrode was ultrasonically treated in a commercial detergent (Yokohama Chemical Technology (Changzhou) Co., Ltd., with an ethylene glycol solvent of ≤10 wt %, and triethanolamine of ≤1 wt %), rinsed in deionized water, ultrasonicated in a mixed solvent of acetone:ethanol (volume ratio 1:1) to remove the oil, baked in a clean environment to completely remove the moisture, and then cleaned with ultraviolet light and ozone.

2) Fabrication of Organic Layer and Cathode:

The glass substrate with the anode layer was placed in a vacuum chamber which was then evacuated to 1×10⁻⁶ to 2×10⁻⁴ Pa. HAT(CN)₆ was deposited, as a hole injection layer, onto the anode film, where the deposition rate was 0.1 nm/s, and the film thickness deposited was 30 nm.

A hole transport layer was deposited on the hole injection layer, where the deposition rate was 0.1 nm/s, and the film thickness deposited was 40 nm.

An organic light-emitting layer was deposited on the hole transport layer. The fabrication process was specifically as follows. A luminescent host material and guest material were deposited under vacuum by means of co-deposition, where the host material was deposited at a rate of 0.1 nm/s, the guest material was deposited at a rate of 0.005 nm/s, and the total film thickness deposited was 40 nm.

An electron transport layer was deposited on the organic light-emitting layer under vacuum, where the deposition rate was 0.1 nm/s, and the total film thickness deposited was 40 nm.

An electron injection layer was deposited on the electron transport layer under vacuum, where the deposition rate was 0.05 nm/s, and the total film thickness deposited was 1 nm.

Al was deposited on the electron injection layer, where the deposition rate was 0.1 nm/s, and the total film thickness deposited was 150 nm.

Device Example 2

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 11.

Device Example 3

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 14.

Device Example 4

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 26.

Device Example 5

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 74.

Device Example 6

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 76.

Device Example 7

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 92.

Device Example 8

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 95.

Device Example 9

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 111.

Device Example 10

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 107.

Device Example 11

This example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound 133.

Comparative Example 1

This comparative example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound E-1.

Comparative Example 2

This comparative example provides an organic light-emitting device, which differs from the organic light-emitting device provided in Device Example 1 in that the host material in the light emitting layer is the compound E-2.

Test Example 1

1. Determination of Thermal Deposition Temperature and Glass Transition Temperature

Determination of thermal decomposition temperature of the compound: The thermal decomposition temperature (Td) of the material of the present invention was determined by using a thermogravimetric analyzer (TGA, US TA TGA55) in a temperature range from room temperature to 600° C. at a heating rate of 10° C./min, under nitrogen atmosphere. A temperature at which 5 wt % loss occurs is defined as the decomposition temperature.

Determination of glass transition temperature of the compound: The glass transition temperature (Tg) of the material according to the present invention was tested by differential scanning calorimetery (DSC, US TA DSC250) in a temperature range from room temperature to 600° C. at a heating rate of 10° C./min and a cooling rate of 10° C./min under nitrogen atmosphere, where two cycles of heating and cooling were performed.

2. Test of LUMO and HOMO Level

The HOMO and LUMO level of the material according to the present invention was tested by cyclic voltammetry (CV, CHI-600E from Shanghai Chenhua Instrument Co., Ltd.) using an electrochemical workstation with platinum (Pt) as a counter electrode and silver/silver chloride (Ag/AgCl) as a reference electrode. Under a nitrogen atmosphere, the test was carried out at a scan rate of 100 mV/s in an electrolyte solution containing 0.1 M tetrabutylammonium hexafluorophosphate in dichloromethane, and the potential was calibrated by ferrocene, in which the potential of ferrocene was set to an absolute energy level under vacuum of −4.8 eV: HOMO=−[E _(onset) ^(ox) −E _(Fc/Fc+)+4.8]eV. LUMO=−[E _(onset) ^(red) −E _(Fc/Fc+)+4.8]eV.

Test of triplet energy level: Toluene was used as a solvent, the compound to be tested was formulated into a solution (with a concentration of 2*10⁻⁵ mol/L), and the solution was tested at −78° C. using a fluorescence spectrophotometer (Hitachi F-4600). E_(T1) (eV) represents the triplet energy level of the compound, which is calculated using a formula below: E _(T1)=1240/λ

where λ is the shortest ultraviolet/visible absorption wavelength.

The test results are shown in Table 1.

TABLE 1 Compound 10 11 14 26 74 76 92 95 111 107 T_(d) (° C.) 394 395 386 385 378 373 375 373 382 381 Tg (° C.) 123 124 140 133 132 128 124 127 124 112 HOMO (eV) −5.2 −5.2 −5.2 −5.3 −5.1 −5.1 −5.1 −5.0 −5.3 −5.2 LUMO (eV) −1.9 −1.9 −2.2 −2.1 −2.1 −2.2 −2.0 −2.2 −1.9 −2.0 E_(T1) (eV) 2.08 2.10 2.28 2.12 2.13 2.09 2.11 2.07 2.09 2.13

The results shown in Table 1 show that the fused polycyclic compound provided in the present invention has a high thermal decomposition temperature, which ensures that the host material formed therefrom can maintain excellent thermal stability in the device, making the device unlikely to deteriorate due to decomposition during the fabrication process. The HOMO level and LUMO level of the fused polycyclic compound provided in the present invention are matched with the adjacent transport layer, so that the OLED device has a small driving voltage.

In addition, the fused polycyclic compound provided in the present invention has a high singlet energy level, ensuring the efficient energy transfer from the host material to the guest material.

Test Example 2

Instruments: The current, voltage, brightness, and lifetime of the device were tested synchronously using PR 650 scanning spectro radiometer and Keithley K2400 digital source meter.

Test conditions: current density 10 mA/cm²; temperature 25° C.

The organic light-emitting devices provided in Device Examples 1-11 and Comparative Examples 1-2 were tested. The results are shown in Table 2.

TABLE 2 Current Current Device Host density/ efficiency/ Chrominance/ Example material Voltage/V mA/cm² cd/A CIE (X, Y) Lifetime/hr 1 10 4.0 10 40 (0.66, 0.31) 130 2 11 4.0 10 39 (0.66, 0.31) 130 3 14 4.2 10 42 (0.66, 0.31) 145 4 26 4.3 10 43 (0.66, 0.31) 132 5 74 4.2 10 44 (0.67, 0.31) 133 6 76 4.2 10 46 (0.66, 0.31) 136 7 92 4.2 10 45 (0.68, 0.31) 131 8 95 4.3 10 47 (0.66, 0.30) 130 9 111 4.2 10 44 (0.68, 0.31) 132 10 107 4.1 10 43 (0.68, 0.30) 133 11 133 4.4 10 40 (0.67, 0.31) 130 Comparative E-1 4.3 10 37 (0.66, 0.31) 127 Example 1 Comparative E-2 4.4 10 36 (0.66, 0.31) 113 Example 2

The organic light-emitting devices provided in Device Examples 1-11 and Comparative Examples 1-2 were tested. The results are shown in Table 2. Compared with the device provided in the comparative examples, the OLED devices provided in the examples of the present invention has lower operating voltage, higher current efficiency, and longer lifetime, indicating that the fused polycyclic compound provided in the present invention, when used as a luminescent host material in an OLED device, can greatly improve the luminescence efficiency, reduce the driving voltage, extend the lifetime, and increase the performance of the OLED device. Notably, the inventors find through research that when the phenyl ring in the structure of the fused polycyclic compound provided in the present invention is not attached, at positions 1 and 2, 2 and 3, or 3 and 4, to

to form a fused ring sharing the same side, the current efficiency and lifetime of the device are seriously affected.

Apparently, the above-described embodiments are merely examples provided for clarity of description, and are not intended to limit the implementations of the present invention. Other variations or changes can be made by those skilled in the art based on the above description. The embodiments are not exhaustive herein. Obvious variations or changes derived therefrom also fall within the protection scope of the present invention. 

What is claimed is:
 1. A compound of Formula IV, having a structure shown below:

wherein a benzo ring represented by

is attached at positions 1 and 2, positions 2 and 3, or positions 3 and 4 to form a fused ring sharing the same side, in which “ ” and “ ” denotes the points of attachment; where when

is attached at positions 3 and 4 to form a fused ring sharing the same side, the compound of Formula IV has a structure below:

when

is attached at positions 2 and 3 to form a fused ring sharing the same side, the compound of Formula IV has a structure below:

and when

is attached at positions 1 and 2 to form a fused ring sharing the same side, the compound of Formula IV has a structure below:

T¹ is independently selected from NR¹⁵, S, O, BR¹⁵, PR¹⁵, and C(R¹⁵)₂, in which R¹⁵ is the same or different, and is each independently selected from methyl, deuterated methyl, phenyl, deuterated phenyl, biphenylyl, deuterated biphenylyl, naphthalenyl, and deuterated naphthalenyl; at least one of T² and T³ is a single bond, when T² is a single bond, T³ is S or O, and when T³ is a single bond, T² is S or O; and R¹-R¹⁴ are the same or different, and are each independently selected from hydrogen, deuterium, methyl, deuterated methyl, phenyl, deuterated phenyl, and deuterated methyl substituted phenyl; at least one of R¹-R¹⁴ is selected from deuterium, deuterated methyl, deuterated phenyl, and deuterated methyl substituted phenyl.
 2. The fused polycyclic compound of Formula IV according to claim 1 selected from the group consisting of


3. A method for preparing a compound of Formula IV according to claim 1, wherein when T¹ is selected from C(R¹⁵)₂, that is, the compound of Formula IV has a structure of Formula IV-1, and T⁴ is selected from Cl C(R¹⁵)₂ or Br C(R¹⁵)₂, the preparation method comprises: subjecting the compound of Formula (E) used as a raw material to a cyclization reaction in the presence of a catalyst to obtain an intermediate compound (F); and coupling the intermediate compound (F) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-1; and the route for preparing the compound of Formula IV-1 is shown below:

alternatively, when T¹ is selected from BR¹⁵, that is, the compound of Formula IV has a structure of Formula IV-2, and T⁴ is selected from hydrogen, the preparation method comprises: reacting the compound of Formula (E) used as a raw material with the compound of Formula (H) in the presence of a catalyst to obtain an intermediate compound (J); and coupling the intermediate compound (J) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-2; and the route for preparing the compound of Formula IV-2 is shown below:

alternatively, when T¹ is selected from O, that is, the compound of Formula IV has a structure of Formula IV-3, and T⁴ is selected from hydroxyl, the preparation method comprises: reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (K); and coupling the intermediate compound (K) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-3; and the route for preparing the compound of Formula IV-3 is shown below:

alternatively, when T¹ is selected from S, that is, the compound of Formula IV has a structure of Formula IV-4, and T⁴ is selected from mercapto, the preparation method comprises: reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (K-1); and coupling the intermediate compound (K-1) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-4; and the route for preparing the compound of Formula IV-4 is shown below:

alternatively, when T¹ is selected from PR¹⁵, that is, the compound of Formula IV has a structure of Formula IV-5, and T⁴ is selected from hydrogen, the preparation method comprises: reacting the compound of Formula (E) used as a raw material in the presence of a catalyst to obtain an intermediate compound (L); reacting the intermediate compound (L) in the presence of a catalyst to obtain an intermediate compound (M); coupling the intermediate compound (M) to the compound of Formula (N) in the presence of a catalyst to obtain an intermediate compound (O); and coupling the intermediate compound (O) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-5; and the route for preparing the compound of Formula IV-5 is shown below:

alternatively, when T¹ is selected from NR¹⁵, that is, the compound of Formula IV has a structure of Formula IV-6, and T⁴ is selected from nitro, the preparation method comprises: reacting the compound of Formula (D) used as a raw material in the presence of a catalyst to obtain an intermediate compound (P); and reacting the intermediate compound (P) with the compound of Formula (Q) and then the compound of Formula (G), to obtain the compound of Formula IV-6; and the route for preparing the compound of Formula IV-6 is shown below:

alternatively, when T¹ is selected from a single bond, that is, the compound of Formula IV has a structure of Formula IV-7, the preparation method comprises: reacting the compound of Formula (R) used as a raw material with the compound of Formula (S) in the presence of a catalyst to obtain an intermediate compound (T); subjecting the intermediate compound (T) to a cyclization reaction in the presence of a catalyst to obtain an intermediate compound (U); and coupling the intermediate compound (U) to the compound of Formula (G) in the presence of a catalyst, to obtain the compound of Formula IV-7; and the route for preparing the compound of Formula IV-7 is shown below:

where W is selected from fluoro, chloro, bromo, or iodo.
 4. The method for preparing a compound of Formula IV according to claim 3, wherein the compound of Formula (E) is prepared through a method comprising: nitrifying the compound of Formula (A) used as a starting raw material in the presence of a catalyst to obtain an intermediate compound (B); coupling the intermediate compound (B) to the compound of Formula (C) in the presence of a catalyst to obtain an intermediate compound (D); and reducing the intermediate compound (D) in the presence of a catalyst, to obtain the compound of Formula (E); and the route for preparing the compound of Formula (E) is shown below:


5. An electronic device, comprising any one or a combination of at least two of the compounds of Formula IV according to claim
 1. 6. The electronic device according to claim 5, which is an organic light emitting device comprising an anode, a cathode, and an organic thin film layer between the anode and the cathode, wherein the organic thin film layer comprises any one or a combination of at least two of the fused polycyclic compounds of Formula IV according to claim
 1. 7. A display device, comprising an electronic device according to claim
 5. 8. A lighting device, comprising an electronic device according to claim
 5. 9. The electronic device according to claim 5, wherein the electronic device is any one of an organic light emitting diode, an organic field effect transistor, an organic thin film transistor, an organic light emitting transistor, an organic integrated circuit, an organic solar cell, an organic field quenching device, a light emitting electrochemical cell, an organic laser diode or an organic photoreceptor.
 10. The electronic device according to claim 6, wherein the organic thin film layer comprises a light-emitting layer, and also any one or a combination of at least two of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer, an electron blocking layer, and a charge transport layer, wherein the light-emitting layer comprises any one or a combination of at least two of the compounds of Formula IV according to claim
 1. 11. The electronic device according to claim 10, wherein the light-emitting layer comprises a host material and a guest material; and the host material in the light-emitting layer comprises any one or a combination of at least two of the compounds of Formula IV according to claim
 1. 